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AP Computer Science 2.1 Standard Algorithms 432 Views
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Description:
APCS: Standard Algorithms Drill 2, Problem 1. How much slower is InefficientSum than EfficientSum in the best case for an array of n elements?
Transcript
- 00:00
Thank you We sneak Here's your shmoop news your it's
- 00:06
a maze ing and not at all corny Alright sorry
- 00:10
Sometimes we just do that Alright Moving on you know
- 00:13
art ignore it Don't throw up art How much slower
- 00:15
is inefficient Some than efficient Some in the best minimum
Full Transcript
- 00:20
case for an array of n elements right here in
- 00:24
the rays list go all right here your potential answers
- 00:29
How many times slower like a rap song All right
- 00:35
well to answer this one we'll have to figure out
- 00:37
how both methods work to see exactly what would make
- 00:40
one of them less efficient than the other so for
- 00:43
efficient Some were creating a loop that begins with its
- 00:46
iterated at one and adds the contents of each following
- 00:49
array element to array in deck zero until we reach
- 00:51
the end In effect index zero becomes the running total
- 00:56
As we travel through the array makes sense and it's
- 00:59
pretty efficient just like the name says inefficient Some creates
- 01:03
a separate variable toe hold are running total then visits
- 01:06
each element of the array as we had done before
- 01:09
but here's the univision part while the value of the
- 01:12
current array element is greater than zero It subtract one
- 01:16
from it and adds one to the some variable Then
- 01:19
it checks it again and again and again And i
- 01:20
will keep doing this until the array element here is
- 01:23
zero So often injure in the array Had a value
- 01:27
of say fifty We'd have to complete this process fifty
- 01:29
times If an imager were a million six hundred four
- 01:32
thousand two hundred ninety three Well yeah inefficient is the
- 01:35
right word for it The difference is a bit like
- 01:37
someone opening a can of corn and eating each nibble
- 01:40
it one by one versus more standard practise of opening
- 01:42
the can and chugging the entire thing right there in
- 01:45
a sec It's the new mcdonald's product It's really cool
- 01:48
and fried Okay from this we can tell that the
- 01:51
larger the values aaron the array the larger the kansas
- 01:54
corn would be and the longer inefficient some would take
- 01:57
But this question is asking for the best case scenario
- 02:00
And by far the best cases faras inefficient Some is
- 02:02
concerned would be in a ray full of zeros It
- 02:04
could be enormous Hundreds of thousands of zeros and we'd
- 02:08
zip right through it Practically the same speed as efficient
- 02:10
son because we'd be avoiding that tedious wild loop entirely
- 02:14
The result in that best all zero case is that
- 02:17
bullet methods would run at the same speed or at
- 02:20
least at such close speeds that it would be difficult 00:02:22.83 --> [endTime] to accurately measure the difference That'll make our answer
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